diff --git a/userspace/digwatch/lua/rule_loader.lua b/userspace/digwatch/lua/rule_loader.lua
index ec4f3583..a7963d9f 100644
--- a/userspace/digwatch/lua/rule_loader.lua
+++ b/userspace/digwatch/lua/rule_loader.lua
@@ -31,6 +31,9 @@ local function mark_relational_nodes(ast, index)
    end
 end
 
+--[[
+   Take a filter AST and set it up in the libsinsp runtime, using the filter API.
+--]]
 local function install_filter(node)
    local t = node.type
 
@@ -60,17 +63,6 @@ local function install_filter(node)
    end
 end
 
-
--- filter.rel_expr("proc.name",  "=", "cat")
--- filter.bool_op("and")
--- filter.nest()
--- filter.nest()
--- filter.rel_expr("fd.num",  "=", "1")
--- filter.bool_op("or")
--- filter.rel_expr("fd.num",  "=", "2")
--- filter.unnest()
--- filter.unnest()
-
 local state
 
 --[[